The Arkansas River is a major tributary of the Mississippi River. It generally flows to the east and southeast as it traverses the U.S. states of Colorado, Kansas, Oklahoma, and Arkansas. The river's source basin lies in Colorado, specifically the Arkansas River Valley. The headwaters derive from the snowpack in the Sawatch and Mosquito mountain ranges. It flows east into Kansas and finally through Oklahoma and Arkansas, where it meets the Mississippi River.
The Boston Mountains is a Level III ecoregion designated by the Environmental Protection Agency (EPA) in the U.S. states of Arkansas and Oklahoma. Part of the Ozarks, the Boston Mountains are a deeply dissected plateau. The ecoregion is steeper than the adjacent Springfield Plateau to the north, and bordered on the south by the Arkansas Valley. The Oklahoma portion of the range is locally referred to as the Cookson Hills. There are several theories of how the mountains were named, though apparently none are related to the Massachusetts city.
Trident Volcano is an eroded volcanic complex on the Alaska Peninsula in Katmai National Park, Alaska. Up to 23 domes comprise the complex stratovolcano, with the greatest elevation of 6,115 feet (1,864 m). The most recent major activity produced a 3,599-foot (1,097 m) dome in an amphitheater on the southwest flank of the southwest peak. Volcano Novarupta formed on its slopes in the largest volcanic eruption of the 20th century.
The New Madrid Seismic Zone (NMSZ), sometimes called the New Madrid Fault Line, is a major seismic zone and a prolific source of intraplate earthquakes in the Southern and Midwestern United States, stretching to the southwest from New Madrid, Missouri.
Savoy is an unincorporated community in Litteral Township, Washington County, Arkansas, United States. It is located on County Route 845 east of Lake Wedington. The Ozark National Forest is just west of the community. The Savoy area is marked with bluffs and streams. A distinctive feature is the dam on Clear Creek where a flour mill was once in operation. Savoy had a post office and businesses that no longer exist.
There are nine named plateaus in Yellowstone National Park. These plateaus are part of the much larger Yellowstone Plateau and dominate areas in the park south and west of the Gallatin and Absaroka mountain ranges. Four of the plateaus are from rhyolite lava flows that occurred between 110,000 and 70,000 years ago.
Skylight is an unincorporated community in Boston Township, of southwestern Washington County, Arkansas, United States. Skylight lies about one mile west-northwest of Skylight Mountain.
Harris is an unincorporated community in Elkins Township, Washington County, Arkansas, United States. It is located east of Fayetteville and within the city limits of Elkins near Arkansas Highway 16.
McNair is an unincorporated community in Fayetteville Township, Washington County, Arkansas, United States. It is located within Fayetteville in the southwest part of town near Baum Stadium. McNair was primarily the location of the switching board off the main Frisco line to the Ozark and Cherokee Central branch which went to Tahlequah.
The Fayetteville Shale is a geologic formation of Mississippian age composed of tight shale within the Arkoma Basin of Arkansas and Oklahoma. It is named for the city of Fayetteville, Arkansas, and requires hydraulic fracturing to release the natural gas contained within.
Baldwin is a former unincorporated community in Fayetteville Township, Washington County, Arkansas, United States. It has since been annexed by Fayetteville. It is located in east Fayetteville along Huntsville Road near Lake Sequoyah toward Elkins.
Banyard is an unincorporated community in Winslow Township, Washington County, Arkansas, United States. It is located on Bunyard Road near the Crawford County line west of the Bobby Hopper Tunnel.
White Rock is an unincorporated community in Fayetteville Township, Washington County, Arkansas, United States. It is located about three miles west of Fayetteville on Arkansas Highway 16. Goose Creek is just south of the community.
Gulley is an unincorporated community in Johnson Township, Washington County, Arkansas, United States. It is located within Johnson, on Johnson Road along the railroad tracks.
Wedington Woods is an unincorporated community in Litteral Township, Washington County, Arkansas, United States. It is located west of Fayetteville, north of Wedington Drive. A small grass airport exists named Wedington Woods Airport.
Habberton is an unincorporated community in Prairie Township, Washington County, Arkansas, United States. It is located along the city limits of Goshen at the intersection of Habberton Road and Habberton Avenue.
Viney Grove is an unincorporated community in Marrs Hill Township, Washington County, Arkansas, United States. It is located north of Prairie Grove and Prairie Grove Battlefield State Park along County Road 37.
Wyman is an unincorporated community in Wyman Township, Washington County, Arkansas, United States. It is located east of the White River, north of Lake Sequoyah, southwest of Goshen, and east of Fayetteville.
Established initially as Alta Villa by Italian immigrants in 1915, Little Italy is an unincorporated community in Pulaski and Perry counties in the U.S. state of Arkansas. The culturally rich and historically significant hamlet is located in high terrain along Arkansas Highway 300 amidst the northeastern foothills of the Ouachita Mountains bestriding Wye Mountain and Kryer Mountain. As part of a multi-decade heritage preservation effort, as of 2018 its residents were seeking status as an incorporated municipality.
United States 
Arkansas 
